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We report an extensive theoretical analysis of point-contact Andreevreflection data available in literature on ferromagnetic CrO$_2$. We find thatthe spectra can be well understood within a model of fully spin-polarized bandsin CrO$_2$ together with spin active scattering at the contact. This is incontrast to analyses of the data within extended Blonder-Tinkham-Klapwijkmodels, which lead to a spin polarization varying between 50~\% and 100~\%depending on the transparency of the interface. We propose to utilize both thetemperature dependence of the spectra and the excess current at voltages abovethe gap to resolve the spin-polarization in CrO$_2$ in a new generation ofexperiments.

Is CrO$_2$ Fully Spin-Polarized? - Analysis of Andreev Spectra and Excess Current